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Novel Core‐Shell System Based on Gelatin and Hydrophilic Polymers Useful as Concrete Self‐healing Systems
Author(s) -
da Costa Vítor Corrêa,
Souza Fernando Gomes,
Sousa Luana de Castro,
Filho Romildo Dias Tolêdo
Publication year - 2021
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.202000180
Subject(s) - gelatin , materials science , thermogravimetric analysis , polymer , fourier transform infrared spectroscopy , composite material , self healing , swelling , differential scanning calorimetry , vinyl alcohol , chemical engineering , organic chemistry , chemistry , thermodynamics , medicine , alternative medicine , physics , pathology , engineering
Concrete structures repair results in substantial economic and environmental issues. So, new technologies able to increase concrete lifetime are being developed. Among them, the self‐healing mechanisms, which can be improved by using polymers. Thus, three different materials are synthesized to act as self‐healing systems. They are: (I) cross‐linked gelatin mixed with CaCO 3 (the self‐healing agent); (II) a core‐shell system based on the material I layered by poly(hydroxypropyl methacrylate); and (III) a second core‐shell structure based on the material I covered with poly(vinyl alcohol). Cross‐linking and grafting are performed using glutaraldehyde. Fourier‐transform infrared spectroscopy (FTIR) proves the structure obtaining. Thermogravimetric analysis and differential scanning calorimetry prove that the materials show thermal properties that allow their use in concrete applications. Swelling degree shows that all materials swell when in contact with water. Granulometry shows the materials are mostly in the millimeter scale. Last, an aqueous media release test shows that the three tested systems did not liberate significant amounts of CaCO 3 . Therefore, both the gelatin and gelatin + polymer systems can protect the healing material, avoiding the release of the self‐healing agent before the concrete cracking takes place.